4.5.2016 Official Journal of the European Union EN L 119/131 Article 63 Transposition 1. Member States shall adopt and publish, by 6 May 2018, the laws, regulations and administrative provisions necessary to comply with this Directive. They shall forthwith notify to the Commission the text of those provisions. They shall apply those provisions from 6 May 2018. When Member States adopt those provisions, they shall contain a reference to this Directive or shall be accompanied by such a reference on the occasion of their official publication. Member States shall determine how such reference is to be made. 2. By way of derogation from paragraph 1, a Member State may provide, exceptionally, where it involves dispropor­ tionate effort, for automated processing systems set up before 6 May 2016 to be brought into conformity with Article 25(1) by 6 May 2023. 3. By way of derogation from paragraphs 1 and 2 of this Article, a Member State may, in exceptional circumstances, bring an automated processing system as referred to in paragraph 2 of this Article into conformity with Article 25(1) within a specified period after the period referred to in paragraph 2 of this Article, if it would otherwise cause serious difficulties for the operation of that particular automated processing system. The Member State concerned shall notify the Commission of the grounds for those serious difficulties and the grounds for the specified period within which it shall bring that particular automated processing system into conformity with Article 25(1). The specified period shall in any event not be later than 6 May 2026. 4. Member States shall communicate to the Commission the text of the main provisions of national law which they adopt in the field covered by this Directive. Article 64 Entry into force This Directive shall enter into force on the day following that of its publication in the Official Journal of the European Union. Article 65 Addressees This Directive is addressed to the Member States. Done at Brussels, 27 April 2016. For the European Parliament For the Council The President The President M. SCHULZ J.A. HENNIS-PLASSCHAERT